Auto-generated commit

Author: stdlib-bot

CHANGELOG.md

@@ -27,6 +27,16 @@
 
 <!-- /.features -->
 
+<section class="bug-fixes">
+
+##### Bug Fixes
+
+-   [`2de9ed7`](https://github.com/stdlib-js/stdlib/commit/2de9ed76d79a2f10a26a5246077199cf70819a89) - guard against proxy traps raising exceptions in REPL tokenizer [(#4457)](https://github.com/stdlib-js/stdlib/pull/4457)
+
+</section>
+
+<!-- /.bug-fixes -->
+
 </details>
 
 </section>
@@ -180,6 +190,7 @@ A total of 4 people contributed to this release. Thank you to the following cont
 
 <details>
 
+-   [`2de9ed7`](https://github.com/stdlib-js/stdlib/commit/2de9ed76d79a2f10a26a5246077199cf70819a89) - **fix:** guard against proxy traps raising exceptions in REPL tokenizer [(#4457)](https://github.com/stdlib-js/stdlib/pull/4457) _(by Snehil Shah)_
 -   [`8dfa851`](https://github.com/stdlib-js/stdlib/commit/8dfa8515051fc7dde731cd8373b17377c7f015b8) - **docs:** update REPL namespace documentation [(#4447)](https://github.com/stdlib-js/stdlib/pull/4447) _(by stdlib-bot)_
 -   [`b718cde`](https://github.com/stdlib-js/stdlib/commit/b718cde9cbff4b49da9caa3282dc72969243903b) - **docs:** update REPL namespace documentation [(#4427)](https://github.com/stdlib-js/stdlib/pull/4427) _(by stdlib-bot, Philipp Burckhardt)_
 -   [`8d7f8e2`](https://github.com/stdlib-js/stdlib/commit/8d7f8e26975ffa5ca2ff11a24eac5f3bba589104) - **refactor:** add specialized handling for displaying ndarrays _(by Athan Reines)_

lib/tokenizer.js

@@ -24,6 +24,7 @@
 
 var parse = require( 'acorn-loose' ).parse;
 var walk = require( 'acorn-walk' );
+var hasProp = require( '@stdlib/assert/has-property' );
 var linkedList = require( '@stdlib/utils/linked-list' );
 var contains = require( '@stdlib/array/base/assert/contains' );
 var resolveLocalScopes = require( './resolve_local_scopes.js' );
@@ -227,7 +228,7 @@ function tokenizer( line, context ) {
 		for ( i = 0; i < COMMANDS.length; i++ ) {
 			command = COMMANDS[ i ];
 			if ( node.name === command[ 0 ] ) {
-				tokens.push( {
+				tokens.push({
 					'value': node.name,
 					'type': 'command',
 					'start': node.start,
@@ -240,14 +241,14 @@ function tokenizer( line, context ) {
 		identifier = context[ node.name ];
 		if ( identifier ) {
 			if ( isLiteralType( typeof identifier ) ) {
-				tokens.push( {
+				tokens.push({
 					'value': node.name,
 					'type': 'variable',
 					'start': node.start,
 					'end': node.end
 				});
 			} else {
-				tokens.push( {
+				tokens.push({
 					'value': node.name,
 					'type': typeof identifier,
 					'start': node.start,
@@ -313,19 +314,27 @@ function tokenizer( line, context ) {
 			}
 			// Case: 'bar' in `foo['bar']` - property already pushed as a string token. Ignore...
 			if ( property.value.type === 'Literal' ) {
-				obj = obj[ property.value.value ];
-				if ( !obj ) {
-					// Property not found in context:
+				try {
+					if ( !hasProp( obj, property.value.value ) ) {
+						// Property not found in context:
+						break;
+					}
+					obj = obj[ property.value.value ];
+				} catch ( error ) { // eslint-disable-line no-unused-vars
 					break;
 				}
 				property = properties.next();
 				continue;
 			}
 			// Case: `foo.bar` - resolve property and push it as a token...
 			if ( property.value.type === 'Identifier' ) {
-				obj = obj[ property.value.name ];
-				if ( !obj ) {
-					// Property not found in context:
+				try {
+					if ( !hasProp( obj, property.value.name ) ) {
+						// Property not found in context:
+						break;
+					}
+					obj = obj[ property.value.name ];
+				} catch ( error ) { // eslint-disable-line no-unused-vars
 					break;
 				}
 				if ( !compute ) {
@@ -356,9 +365,13 @@ function tokenizer( line, context ) {
 					// Couldn't compute the internal `MemberExpression` into a definite name:
 					break;
 				}
-				obj = obj[ computed ];
-				if ( !obj ) {
-					// Property not found in context:
+				try {
+					if ( !hasProp( obj, computed ) ) {
+						// Property not found in context:
+						break;
+					}
+					obj = obj[ computed ];
+				} catch ( error ) { // eslint-disable-line no-unused-vars
 					break;
 				}
 				property = properties.next();